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Kaspersky FileManager Cross Site Scripting

Kaspersky FileManager Cross Site Scripting
Posted Sep 2, 2016
Authored by Vulnerability Laboratory, Lawrence Amer | Site vulnerability-lab.com

The Kaspersky Company Account FileManager functionality suffered from a cross site scripting vulnerability.

tags | exploit, xss
SHA-256 | 171a850a5928f786350145ec8ac8f5eed7f38739167d7014e982b446ea8c8ca1

Kaspersky FileManager Cross Site Scripting

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Document Title:
Kaspersky Company Account - FileManager Vulnerability

References (Source):

Release Date:

Vulnerability Laboratory ID (VL-ID):

Common Vulnerability Scoring System:

Product & Service Introduction:
Kaspersky Lab is an international software security group operating in almost 200 countries and territories worldwide. The company is
headquartered in Moscow, Russia, with its holding company registered in the United Kingdom. Kaspersky Lab currently employs over 2,850
qualified specialists. It has 31 representative territory offices in 30 countries and its products and technologies provide service
for over 300 million users and over 250,000 corporate clients worldwide. The company is specially focused on large enterprises, and
small- and medium-sized businesses.

(Copy of the Homepage: https://en.wikipedia.org/wiki/Kaspersky_Lab )

Abstract Advisory Information:
The vulnerability laboratory core research team discovered an application-side input validation vulnerability in the official Kaspersky company account FileManager application.

Vulnerability Disclosure Timeline:
2016-08-30: Public Disclosure (Vulnerability Laboratory)

Discovery Status:

Affected Product(s):
Kaspersky Labs
Product: Filemanager (Company Account) - Online Service (Web-Application) 2016 Q3

Exploitation Technique:

Severity Level:

Technical Details & Description:
Remote attackers are able to inject malicious java script code in the search query into the main module of file manager in the
kaspersky company account online web application . The vulnerable module Manage FTP attachment Tool suffer from persistent cross
site scripting vulnerability that occurs when processing to search or save queries in the application. The request method to
inject is POST and the attack vector is located on the application-side. Due to our investigation we discovered that attackers
are able to save and bookmark the malicious java script code by usage of the current option to save the queries on default.

Vulnerable Module(s):
[+] /arsys/forms/cssapp/SRS:Attachments/attachments/

Vulnerable Request(s):
[+] POST / GET

Proof of Concept (PoC):
The application-side web vulnerabilities can be exploited by remote attackers with low privileged application user account and low or medium user interaction.
For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue.

Manual steps to reproduce the vulnerability ...
1. User register at kaspersky company account .
2. User goes to vulnerable module to inject own code :
3. Click on advanced search then type this payload : $"><img src="c"
onerror="alert(1)"><script>alert(1)</script> "><img src="c"
4. Attacker make a search query . and execution of XSS occurs .
5. Attacker then goes to searches and save it to bookmark it.
6. Successfully reproduce of the vulnerability!

PoC: Video

Solution - Fix & Patch:
The vulnerability has been patched two days after the report has been arrived by the kaspersky service developer group in coordination with the official apt team.

Security Risk:
The security risk of the application-side input validation web vulnerabilities in the kaspersky customer filemanager is estimated as medium. (CVSS 3.5)

Credits & Authors:
Vulnerability Laboratory [Research Team] - Lawrence Amer (http://www.vulnerability-lab.com/show.php?user=Lawrence%20Amer)

Disclaimer & Information:
The information provided in this advisory is provided as it is without any warranty. Vulnerability Lab disclaims all warranties, either expressed
or implied, including the warranties of merchantability and capability for a particular purpose. Vulnerability-Lab or its suppliers are not liable
in any case of damage, including direct, indirect, incidental, consequential loss of business profits or special damages, even if Vulnerability-Lab
or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability mainly for
consequential or incidental damages so the foregoing limitation may not apply. We do not approve or encourage anybody to break any licenses, policies,
deface websites, hack into databases or trade with stolen data.

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